Electric bell.



PATENTED DEC. 17, 1907.

J, P. McBLROY. ELECTRIC BELL. APPLICATION FILED 133.21, 1907 rlLlllllllllnl m 3 wd W F 1.

ITED stnrrns PATENT oFFIoE.

' 'JAMES F. McELROY, 'ALBAN'Y NEW YORK, ASSIGNOR TO CONSOLIDATED OAR HEATING I I COMPANY, or ALBANY, NEW YORK, A CORPORATION OF WEST VIRGINIA.

swarms BELL.

3 Specification of Letters Patent.

Patented n e. 1'7, 1907.

Application filed February 21,1907 Serial No. 368,650.

To all whom it may concern:

Be it known that 1, JAMES F. MoELRoY, a citizen-oi the United States, residin at Albany, in the county of Albany and tate of New York, have invented certain new and useful Improvements in Electric Bells, ofwhich the following is a specification.

This invention relates to electro-magnetic trembler bells, and its object is to provide an improved compact structure in which the electrical conductors are insulated from the frame of the bell, such bells being especiall adaptedfor use on high-voltage circuits suc as the power circuits of trolley-cars, the insulated construction preventirfg the occurrence of injury or shock due to a persons accidentally touching the bell.

Of the accompanying drawings, Figure 1 represents a view in vertical section and elevation showing an electric-bell embodyin my invention. Fig. 2 represents a plan an section showing the" interior parts removed from the frame. Fig. 3 represents an end view of such parts. Fig. 4 represents a detail view of the hammer and vibrator.

10 is a cup-shaped hollow base or frame having the sounding bell 11 attached to its upper side by a suitable post 12 and screw 13;

14 is a sub-frame attached by screws 15 to the under side of the top wall of base 10 and supporting the main working parts.- This frame forms the yoke for the magnet cores 16 on which the wire spools 17 are mounted, and it is extended out below and in front of said spools to support the pivoted armature 18 and a horizontal cross-bar 19 on which the vibrator 20 is mounted.

21 is a pivot at the lower end of the armature 18, and 22 is a pivot atits upper end connecting it with one end of the horizontal hammer 23. The striking end of the latter is supported in an aperture in a down-turned 'lip 24 on the sub-frame, andprojects through a hole inthe base 10 so as to strike the inner side of hell 11.

-The vibrator 20 comprises a flat sprin fixed by one end to the insulating bar 19 an cooperating with a fixed contact 25 at the opposite end of said bar so as to constitute an interrupter for the circuit of the bell magnet. Its connection with the hammer 23 and the armature 18 is effected by interposing the middle of the vibrator between two short posts 26 of insulating material compactly mounted and mainly contained within and rotected by the hollow base while the e ectrical conductors are thoroughlyv insulated from the frame andall externally exposed metal parts of thebell.

It will be observed that the base 10 is an inverted hollow cup'with the bell 11 attached on the outer side of its bottom wall and overla ing the'bottom wall portion of said base w Ile the magnet and Working arts are attached on the inner side of said ottom wall. Thus the working parts are protected even when the bell 11 is removed and are accessible through the open end of the base by detaching the base from its support, to which latter the base may be secured by suitable fastenings engaging its marginal flange. Also it will be observed that the subframe 14 which may be struck up out of sheet metal is made substantially L-shaped with a portionat right-angles to the bottom wall of the base 10 for-affixing the magnet cores and attaching the subframe to the base, and a portion parallel with said bottom wall carrying the pivoted armature and vibrator. The maximum compactness and simplicity are thus attained. The s ring vibrator 20 operates both to yieldingy retract the hammer 23 after the circuit is broken at 25 and also'to limit this retracting movement through the agenc' of the insulating bloc-ks 2-6 embracing the vi rator arm.

I claim 1. An electric bell comprising an inverted cup-shaped base with a sounding bell at- I tached to the outer side of its bottom wall and overlapping the outer portion of the base, a magnet attached to the inner side of said bottom wall, a sliding hammer substantially parallel to the bottom wall and projecting through the side wall of the base to engage the inner side of the bell, a pivoted armature engaging said 111111111101, and a circuit interrupter operated by the armature.

2. An electric bell comprising a hollow base, a sounding-bell mounted thereon, a, said twosp'ool magnet contained within base, a sliding hannner mounted between the magnet spools and having its striking and slidingly supported and I projecting through the wall of the base to contact With the inner side of the sounding-bell, an annature pivoted by one end and having its opposite end pivoted to and supporting one end of 1 a circuit interrupter op! the hannner, and ated by said armature.

3. An electric bell comprising an inverted cup-sl1aped base with asounding bell 1nounted on the outer side thereof, a substantially L-shaped sub-twine attached to the bottom wall of the base on the inner side thereof and having a portion at right-angles to said bot tom wall and a portion parallel thereto, a

magnet attached to theright-angled portion 1nagnet, an armature therefor, a hammer connected with said armature and having a pair of insulating blocks, and an independently mounted spring vibrator arin interposed between sald blocks for interrupting the magnet circuit and for producing and limiting the retracting movement 01' the hammer.

A11 electric bell comprising a hollow base, a sounding-bell mounted thereon, a sub-frame mounted within said base and carrying n1ag11et-spools, a hammer mounted between said spools and having a pair of jaws at the end opposite the striking end, a spring vibrator-arm mounted between and insulated from said jaws for interrupting the magnet circuit and also insulated from the sub-frame, and an armature pivotally connected at one end fit-l1 said sub-frame and pivotally connected at its opposite end with the aw end of said hanuner.

6,9111 electric bell. comprising a hollow structure including a base and an attached sounding hell, a sliding hannner movable diametrically of-thebell to strilceits inner side, a magnet within said structure having its core parallel with thehannner, an armature pivoted at one end to the base and at the other end pivotally supporting the 1111111- 11181, and a circuit-interrupting spring arin projecting across the hammer and tho armature andhaving an insulated engagement with the pivotally-supported end of the hammer. 1

In testimony whereof I have. hereunto set my hand in the presence of two subscribing witnesses, the 16th dayof February 1907.

JAMES F. MOELROY. 

